Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6e916f040d8c09…

MALICIOUS

PDF

49.8 KB Created: 2021-06-11 05:01:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eda305195002e7280d44e89e81b42f87 SHA-1: 0ceee215e70abe3fddb4616bb6c27d301665e68e SHA-256: 8f6e916f040d8c09c4314019a052d9a0ae1f2edb53e4bc0ad9a19c383da4f31b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which are disguised as PDF files related to game hacks and cheats. The presence of a fake CAPTCHA heuristic indicates an attempt to trick the user into interacting with the document, likely by clicking these links. The ML classifier also flagged this PDF as malicious, suggesting it's part of a campaign to drive users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/how-to-cheat-your-values-in-roblox-boxing-simulator-2-game-hack PDF link annotation
    • http://sv-nahetal.de/images/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/i-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/cheat-way-to-give-robux-to-friends-on-roblox_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A8 26460 bytes
SHA-256: 2d910e493724581a82ad06779ca36c0cf80fff0ccc0c33c09f713623d9cbc945
font_01_sfnt_off00008ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB6 19672 bytes
SHA-256: 88cf5753194d0f34fb4d96d6ee9ad30ef5132cfeff827f1f402b0fb4e2bf970c

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